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Run results for:
1000 x event listeners vs single event listener with array of 1000 callbacks
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<iframe src="https://measurethat.net/Embed?id=605489" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (iPhone; CPU iPhone OS 18_4_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.4 Mobile/15E148 Safari/604.1
Browser:
Mobile Safari 18
Operating system:
iOS 18.4.1
Device Platform:
Mobile
Date tested:
one year ago
1 event listener handling an array of 1000 callbacks
38K/s
1000 event listeners
417/s
View exact numbers
Test name
Executions per second
✓
1 event listener handling an array of 1000 callbacks
38,420 Ops/sec
1000 event listeners
417 Ops/sec
Tests:
1000 event listeners
let i = 1001; const results = []; while (--i) { const index = i; window.addEventListener('custom:test', () => { results.push(index); }, {once: true}); } window.dispatchEvent(new CustomEvent('custom:test'));
1 event listener handling an array of 1000 callbacks
let i = 1001; const results = []; const callbacks = []; while (--i) { const index = i; callbacks.push(() => { results.push(index); }) } window.addEventListener('custom:test', () => { callbacks.forEach((cb) => { cb() }) }, {once: true}); window.dispatchEvent(new CustomEvent('custom:test'));